<template>
  <view>
    <my-search @click="gotoSearch"></my-search>
    <view class="scroll-view-container">
      <!-- 左侧的滚动视图区域 -->
      <scroll-view class="left-scroll-view" scroll-y :style="{height: wh + 'px'}">
        <block v-for="(item, i) in cateList" :key="i">
             <view :class="['left-scroll-view-item', i === active ? 'active' : '']" @click="activeChanged(i)">{{item.cat_name}}</view>
        </block>
      </scroll-view>
      <!-- 右侧的滚动视图区域 -->
      <scroll-view class="right-scroll-view" scroll-y :style="{height: wh + 'px'}" :scroll-top="scrollTop">
        <view class="cate-lv2" v-for="(item2, i2) in cateLevel2" :key="i2">
          <view class="cate-lv2-title">/ {{item2.cat_name}} /</view>
           <!-- 动态渲染三级分类的列表数据 -->
            <view class="cate-lv3-list">
              <!-- 三级分类 Item 项 -->
              <view class="cate-lv3-item" v-for="(item3, i3) in item2.children" :key="i3" @click="gotoGoodsList(item3)">
                <!-- 图片 -->
                <image :src="item3.cat_icon.replace('dev','web')"></image>
                <!-- 文本 -->
                <text>{{item3.cat_name}}</text>
              </view>
            </view>
        </view>
      </scroll-view>
    </view>
  </view>
</template>

<script>
  import badgeMix from '@/mixins/tabbar-badge.js'
  
  export default {
    mixins: [badgeMix],
    data() {
      return {
        // 设备可用高度
        wh:0,
        cateList:[],
        active:0,
        //二级分类列表
        cateLevel2:[],
        scrollTop:0
      };
    },
    onLoad(){
      const sysInfo = uni.getSystemInfoSync()
      console.log(sysInfo)
      this.wh=sysInfo.windowHeight - 50
      
      this.getCateList()
    },
    methods: {
      //获取分类列表数据
     async getCateList() {
         // 发起请求
         const { data: res } = await uni.$http.get('/api/public/v1/categories')
         // 判断是否获取失败
         if (res.meta.status !== 200) return uni.$showMsg()
         // 转存数据
         this.cateList = res.message
         // 为二级分类赋值
        this.cateLevel2 = res.message[0].children
       },
        activeChanged(i) {
           this.active = i
           // 为二级分类列表重新赋值
          this.cateLevel2 = this.cateList[i].children
          this.scrollTop = this.scrollTop ? 0 : 1
        },
        // 点击三级分类项跳转到商品列表页面
        gotoGoodsList(item3) {
          uni.navigateTo({
            url: '/subpkg/goods_list/goods_list?cid=' + item3.cat_id
          })
        },
        gotoSearch() {
          uni.navigateTo({
            url: '/subpkg/search/search'
          })
        }
    }
  }
</script>

<style lang="scss">
  .scroll-view-container{
    display: flex;
    .left-scroll-view{
      width: 120px;
      .left-scroll-view-item{
        background-color: #f7f7f7;
        line-height: 60px;
        text-align: center;
        font-size: 12px;
         // 激活项的样式
      &.active {
        background-color: #ffffff;
        position: relative;
        // 渲染激活项左侧的红色指示边线
        &::before {
          content: ' ';
          display: block;
          width: 3px;
          height: 30px;
          background-color: #c00000;
          position: absolute;
          left: 0;
          top: 50%;
          transform: translateY(-50%);
        }
      }
      }
    }
    .cate-lv2-title {
      font-size: 12px;
      font-weight: bold;
      text-align: center;
      padding: 15px 0;
    }
    .cate-lv3-list {
      display: flex;
      flex-wrap: wrap;
    
      .cate-lv3-item {
        width: 33.33%;
        margin-bottom: 10px;
        display: flex;
        flex-direction: column;
        justify-content: center;
        align-items: center;
    
        image {
          width: 60px;
          height: 60px;
        }
    
        text {
          font-size: 12px;
        }
      }
    }
  }

</style>
